{"kind":"host","input":"mx1.fio.cz","report":{"host":"mx1.fio.cz","checkedAt":"2026-11-05T16:07:08.601Z","a":{"status":"found","values":["92.38.6.38"],"ttl":7200,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only"},"readiness":{"grade":"D","summary":"The website has no IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"fail","detail":"mx1.fio.cz has no AAAA record."},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"No MX records, so mail goes to the domain's own address (implicit MX). It has no AAAA record."},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"4 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"ns1.fio.cz","ipv6":false},{"host":"ns2.fio.cz","ipv6":false},{"host":"dns41.cloudns.net","ipv6":true},{"host":"dns42.cloudns.net","ipv6":true},{"host":"dns43.cloudns.net","ipv6":true},{"host":"dns44.cloudns.net","ipv6":true}]}]},"receiptId":"Kj98qX4QDv","reused":true,"measuredAt":"2026-11-05T16:07:08.917Z"}